Product Description:

The KDA 2.1-050-3-AY0-W1 spindle drive is manufactured by Bosch Rexroth Indramat within the KDA Spindle Drives series. Designed for machine-tool spindles, it converts the regulated DC bus from the power supply into controlled three-phase output while processing speed feedback from motor encoders. By delivering closed-loop current and velocity control, the unit allows high-speed cutting heads and grinding spindles to maintain commanded speed profiles under changing mechanical load. That feedback path helps the drive correct speed deviations quickly during demanding machining cycles. It is intended for spindle applications that require steady rotation during tool engagement and rapid recovery after transient load changes.

The drive draws its power from a DC bus rated at 300 VDC, and its output stage can continuously furnish 50 A to the connected motor winding, giving the axis current reserve for rapid acceleration. Thermal energy is removed by a mounted heat sink blower that operates from an auxiliary supply of 220 V at 50–60 Hz. This separate cooling supply keeps airflow independent of the motor power output stage. The unit uses forced cooling, so the blower must remain active whenever the drive is enabled. Position accuracy is also supported by an internal terminal that accepts a second encoder input for synchronous feedback.

Installation parameters restrict ambient conditions to 5 to 45 °C, protecting the semiconductors from temperature-related drift. Elevation must not exceed 1000 m above sea level so the blower can move enough air through the heat sink. Command signals from the CNC are transmitted as an analog voltage, which the control logic converts into switching patterns for the power stage. The unit has no additional interface option, and the control logic is labeled 2. That arrangement keeps the signal interface simple when no optional communication expansion is required. Status and operating data can still be observed through the standard diagnostic bus.